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A016145
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Expansion of 1/((1-3x)(1-10x)).
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2
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1, 13, 139, 1417, 14251, 142753, 1428259, 14284777, 142854331, 1428562993, 14285688979, 142857066937, 1428571200811, 14285713602433, 142857140807299, 1428571422421897, 14285714267265691, 142857142801797073
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = (10^(n+1) - 3^(n+1))/7 = 10*a(n-1) + 3^n = 3*a(n-1)+10^n. - Henry Bottomley, Jul 25 2001
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MATHEMATICA
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CoefficientList[Series[1/((1-3x)(1-10x)), {x, 0, 20}], x] (* or *) LinearRecurrence[{13, -30}, {1, 13}, 20] (* Harvey P. Dale, May 04 2018 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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